Shelf system



FIG. 1 is a perspective view of the shelf system having a knob-enabledsuction structure;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The broken lines showing in the figures are included for the purpose ofillustrating portions of the shelf system and form no part of theclaimed design. The broken lines showing immediately adjacent the shadedareas represent boundaries to the claimed design and form no part of theclaimed design.

CLAIM The ornamental design for a shelf system, as shown and described.